Adds serial commands to get stats

- Added formatStatsReply, formatRadioStatsReply, and formatPacketStatsReply methods in MyMesh for both simple_repeater, simple_room_server, and simple_sensor.
- Updated CommonCLI to handle new stats commands.

examples/simple_repeater/MyMesh.h

@@ -30,6 +30,7 @@
 #include <helpers/IdentityStore.h>
 #include <helpers/SimpleMeshTables.h>
 #include <helpers/StaticPoolPacketManager.h>
+#include <helpers/StatsFormatHelper.h>
 #include <helpers/TxtDataHelpers.h>
 
 #ifdef WITH_BRIDGE
@@ -183,6 +184,9 @@ public:
   void setTxPower(uint8_t power_dbm) override;
   void formatNeighborsReply(char *reply) override;
   void removeNeighbor(const uint8_t* pubkey, int key_len) override;
+  void formatStatsReply(char *reply) override;
+  void formatRadioStatsReply(char *reply) override;
+  void formatPacketStatsReply(char *reply) override;
 
   mesh::LocalIdentity& getSelfId() override { return self_id; }